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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abdbdd967a6c9db777081ca411ca79113d1e16c022d850d8904b21da808223c' 
  AND token = '+iMuFMI12SPwqwK1LM9BMpcANKQXv19I201ZreWa168=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}